545 lines
14 KiB
C
545 lines
14 KiB
C
/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <ctype.h>
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#include <fcntl.h>
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#include <stdarg.h>
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#include <dirent.h>
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#include <limits.h>
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#include <errno.h>
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#include <cutils/misc.h>
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#include <cutils/sockets.h>
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#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
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#include <sys/_system_properties.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <sys/select.h>
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <sys/mman.h>
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#include <sys/atomics.h>
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#include <private/android_filesystem_config.h>
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#include "property_service.h"
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#include "init.h"
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#include "util.h"
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#include "log.h"
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#define PERSISTENT_PROPERTY_DIR "/data/property"
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static int persistent_properties_loaded = 0;
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static int property_area_inited = 0;
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static int property_set_fd = -1;
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/* White list of permissions for setting property services. */
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struct {
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const char *prefix;
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unsigned int uid;
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unsigned int gid;
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} property_perms[] = {
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{ "net.rmnet", AID_RADIO, 0 },
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{ "net.gprs.", AID_RADIO, 0 },
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{ "net.ppp", AID_RADIO, 0 },
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{ "ril.", AID_RADIO, 0 },
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{ "gsm.", AID_RADIO, 0 },
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{ "persist.radio", AID_RADIO, 0 },
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{ "net.dns", AID_RADIO, 0 },
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{ "net.", AID_SYSTEM, 0 },
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{ "dev.", AID_SYSTEM, 0 },
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{ "runtime.", AID_SYSTEM, 0 },
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{ "hw.", AID_SYSTEM, 0 },
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{ "sys.", AID_SYSTEM, 0 },
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{ "service.", AID_SYSTEM, 0 },
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{ "wlan.", AID_SYSTEM, 0 },
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{ "bt.", AID_BLUETOOTH, 0 },
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{ "dhcp.", AID_SYSTEM, 0 },
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{ "dhcp.", AID_DHCP, 0 },
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{ "vpn.", AID_SYSTEM, 0 },
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{ "vpn.", AID_VPN, 0 },
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{ "debug.", AID_SHELL, 0 },
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{ "log.", AID_SHELL, 0 },
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{ "service.adb.root", AID_SHELL, 0 },
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{ "persist.sys.", AID_SYSTEM, 0 },
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{ "persist.service.", AID_SYSTEM, 0 },
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{ "persist.security.", AID_SYSTEM, 0 },
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{ "hw.fm.", AID_FM_RADIO, 0 },
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{ "crypto.", AID_MEDIA, 0 },
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{ "bluetooth.", AID_SYSTEM, 0 },
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{ "wifi.", AID_WIFI, 0 },
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{ NULL, 0, 0 }
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};
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/*
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* White list of UID that are allowed to start/stop services.
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* Currently there are no user apps that require.
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*/
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struct {
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const char *service;
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unsigned int uid;
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unsigned int gid;
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} control_perms[] = {
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{ "dumpstate",AID_SHELL, AID_LOG },
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{ "fm_dl", AID_FM_RADIO, AID_FM_RADIO},
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{NULL, 0, 0 }
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};
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typedef struct {
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void *data;
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size_t size;
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int fd;
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} workspace;
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static int init_workspace(workspace *w, size_t size)
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{
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void *data;
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int fd;
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/* dev is a tmpfs that we can use to carve a shared workspace
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* out of, so let's do that...
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*/
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fd = open("/dev/__properties__", O_RDWR | O_CREAT, 0600);
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if (fd < 0)
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return -1;
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if (ftruncate(fd, size) < 0)
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goto out;
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data = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
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if(data == MAP_FAILED)
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goto out;
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close(fd);
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fd = open("/dev/__properties__", O_RDONLY);
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if (fd < 0)
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return -1;
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unlink("/dev/__properties__");
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w->data = data;
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w->size = size;
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w->fd = fd;
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return 0;
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out:
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close(fd);
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return -1;
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}
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/* (8 header words + 247 toc words) = 1020 bytes */
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/* 1024 bytes header and toc + 247 prop_infos @ 128 bytes = 32640 bytes */
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#define PA_COUNT_MAX 247
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#define PA_INFO_START 1024
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#define PA_SIZE 32768
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static workspace pa_workspace;
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static prop_info *pa_info_array;
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extern prop_area *__system_property_area__;
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static int init_property_area(void)
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{
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prop_area *pa;
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if(pa_info_array)
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return -1;
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if(init_workspace(&pa_workspace, PA_SIZE))
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return -1;
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fcntl(pa_workspace.fd, F_SETFD, FD_CLOEXEC);
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pa_info_array = (void*) (((char*) pa_workspace.data) + PA_INFO_START);
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pa = pa_workspace.data;
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memset(pa, 0, PA_SIZE);
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pa->magic = PROP_AREA_MAGIC;
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pa->version = PROP_AREA_VERSION;
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/* plug into the lib property services */
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__system_property_area__ = pa;
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property_area_inited = 1;
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return 0;
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}
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static void update_prop_info(prop_info *pi, const char *value, unsigned len)
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{
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pi->serial = pi->serial | 1;
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memcpy(pi->value, value, len + 1);
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pi->serial = (len << 24) | ((pi->serial + 1) & 0xffffff);
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__futex_wake(&pi->serial, INT32_MAX);
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}
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static int property_write(prop_info *pi, const char *value)
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{
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int valuelen = strlen(value);
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if(valuelen >= PROP_VALUE_MAX) return -1;
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update_prop_info(pi, value, valuelen);
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return 0;
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}
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/*
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* Checks permissions for starting/stoping system services.
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* AID_SYSTEM and AID_ROOT are always allowed.
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*
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* Returns 1 if uid allowed, 0 otherwise.
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*/
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static int check_control_perms(const char *name, unsigned int uid, unsigned int gid) {
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int i;
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if (uid == AID_SYSTEM || uid == AID_ROOT)
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return 1;
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/* Search the ACL */
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for (i = 0; control_perms[i].service; i++) {
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if (strcmp(control_perms[i].service, name) == 0) {
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if ((uid && control_perms[i].uid == uid) ||
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(gid && control_perms[i].gid == gid)) {
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return 1;
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}
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}
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}
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return 0;
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}
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/*
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* Checks permissions for setting system properties.
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* Returns 1 if uid allowed, 0 otherwise.
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*/
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static int check_perms(const char *name, unsigned int uid, unsigned int gid)
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{
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int i;
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if (uid == 0)
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return 1;
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if(!strncmp(name, "ro.", 3))
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name +=3;
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for (i = 0; property_perms[i].prefix; i++) {
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int tmp;
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if (strncmp(property_perms[i].prefix, name,
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strlen(property_perms[i].prefix)) == 0) {
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if ((uid && property_perms[i].uid == uid) ||
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(gid && property_perms[i].gid == gid)) {
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return 1;
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}
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}
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}
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return 0;
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}
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const char* property_get(const char *name)
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{
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prop_info *pi;
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if(strlen(name) >= PROP_NAME_MAX) return 0;
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pi = (prop_info*) __system_property_find(name);
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if(pi != 0) {
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return pi->value;
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} else {
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return 0;
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}
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}
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static void write_persistent_property(const char *name, const char *value)
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{
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const char *tempPath = PERSISTENT_PROPERTY_DIR "/.temp";
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char path[PATH_MAX];
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int fd, length;
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snprintf(path, sizeof(path), "%s/%s", PERSISTENT_PROPERTY_DIR, name);
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fd = open(tempPath, O_WRONLY|O_CREAT|O_TRUNC, 0600);
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if (fd < 0) {
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ERROR("Unable to write persistent property to temp file %s errno: %d\n", tempPath, errno);
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return;
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}
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write(fd, value, strlen(value));
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fsync(fd);
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close(fd);
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if (rename(tempPath, path)) {
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unlink(tempPath);
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ERROR("Unable to rename persistent property file %s to %s\n", tempPath, path);
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}
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}
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int property_set(const char *name, const char *value)
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{
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prop_area *pa;
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prop_info *pi;
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int namelen = strlen(name);
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int valuelen = strlen(value);
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if(namelen >= PROP_NAME_MAX) return -1;
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if(valuelen >= PROP_VALUE_MAX) return -1;
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if(namelen < 1) return -1;
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pi = (prop_info*) __system_property_find(name);
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if(pi != 0) {
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/* ro.* properties may NEVER be modified once set */
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if(!strncmp(name, "ro.", 3)) return -1;
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pa = __system_property_area__;
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update_prop_info(pi, value, valuelen);
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pa->serial++;
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__futex_wake(&pa->serial, INT32_MAX);
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} else {
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pa = __system_property_area__;
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if(pa->count == PA_COUNT_MAX) return -1;
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pi = pa_info_array + pa->count;
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pi->serial = (valuelen << 24);
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memcpy(pi->name, name, namelen + 1);
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memcpy(pi->value, value, valuelen + 1);
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pa->toc[pa->count] =
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(namelen << 24) | (((unsigned) pi) - ((unsigned) pa));
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pa->count++;
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pa->serial++;
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__futex_wake(&pa->serial, INT32_MAX);
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}
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/* If name starts with "net." treat as a DNS property. */
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if (strncmp("net.", name, strlen("net.")) == 0) {
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if (strcmp("net.change", name) == 0) {
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return 0;
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}
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/*
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* The 'net.change' property is a special property used track when any
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* 'net.*' property name is updated. It is _ONLY_ updated here. Its value
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* contains the last updated 'net.*' property.
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*/
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property_set("net.change", name);
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} else if (persistent_properties_loaded &&
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strncmp("persist.", name, strlen("persist.")) == 0) {
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/*
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* Don't write properties to disk until after we have read all default properties
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* to prevent them from being overwritten by default values.
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*/
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write_persistent_property(name, value);
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}
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property_changed(name, value);
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return 0;
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}
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static int property_list(void (*propfn)(const char *key, const char *value, void *cookie),
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void *cookie)
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{
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char name[PROP_NAME_MAX];
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char value[PROP_VALUE_MAX];
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const prop_info *pi;
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unsigned n;
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for(n = 0; (pi = __system_property_find_nth(n)); n++) {
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__system_property_read(pi, name, value);
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propfn(name, value, cookie);
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}
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return 0;
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}
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void handle_property_set_fd()
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{
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prop_msg msg;
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int s;
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int r;
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int res;
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struct ucred cr;
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struct sockaddr_un addr;
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socklen_t addr_size = sizeof(addr);
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socklen_t cr_size = sizeof(cr);
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if ((s = accept(property_set_fd, (struct sockaddr *) &addr, &addr_size)) < 0) {
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return;
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}
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/* Check socket options here */
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if (getsockopt(s, SOL_SOCKET, SO_PEERCRED, &cr, &cr_size) < 0) {
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close(s);
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ERROR("Unable to recieve socket options\n");
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return;
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}
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r = recv(s, &msg, sizeof(msg), 0);
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close(s);
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if(r != sizeof(prop_msg)) {
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ERROR("sys_prop: mis-match msg size recieved: %d expected: %d\n",
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r, sizeof(prop_msg));
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return;
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}
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switch(msg.cmd) {
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case PROP_MSG_SETPROP:
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msg.name[PROP_NAME_MAX-1] = 0;
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msg.value[PROP_VALUE_MAX-1] = 0;
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if(memcmp(msg.name,"ctl.",4) == 0) {
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if (check_control_perms(msg.value, cr.uid, cr.gid)) {
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handle_control_message((char*) msg.name + 4, (char*) msg.value);
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} else {
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ERROR("sys_prop: Unable to %s service ctl [%s] uid: %d pid:%d\n",
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msg.name + 4, msg.value, cr.uid, cr.pid);
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}
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} else {
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if (check_perms(msg.name, cr.uid, cr.gid)) {
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property_set((char*) msg.name, (char*) msg.value);
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} else {
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ERROR("sys_prop: permission denied uid:%d name:%s\n",
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cr.uid, msg.name);
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}
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}
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break;
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default:
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break;
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}
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}
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void get_property_workspace(int *fd, int *sz)
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{
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*fd = pa_workspace.fd;
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*sz = pa_workspace.size;
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}
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static void load_properties(char *data)
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{
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char *key, *value, *eol, *sol, *tmp;
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sol = data;
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while((eol = strchr(sol, '\n'))) {
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key = sol;
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*eol++ = 0;
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sol = eol;
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value = strchr(key, '=');
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if(value == 0) continue;
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*value++ = 0;
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while(isspace(*key)) key++;
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if(*key == '#') continue;
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tmp = value - 2;
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while((tmp > key) && isspace(*tmp)) *tmp-- = 0;
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while(isspace(*value)) value++;
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tmp = eol - 2;
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while((tmp > value) && isspace(*tmp)) *tmp-- = 0;
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property_set(key, value);
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}
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}
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static void load_properties_from_file(const char *fn)
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{
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char *data;
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unsigned sz;
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data = read_file(fn, &sz);
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if(data != 0) {
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load_properties(data);
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free(data);
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}
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}
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static void load_persistent_properties()
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{
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DIR* dir = opendir(PERSISTENT_PROPERTY_DIR);
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struct dirent* entry;
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char path[PATH_MAX];
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char value[PROP_VALUE_MAX];
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int fd, length;
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if (dir) {
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while ((entry = readdir(dir)) != NULL) {
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if (strncmp("persist.", entry->d_name, strlen("persist.")))
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continue;
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#if HAVE_DIRENT_D_TYPE
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if (entry->d_type != DT_REG)
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continue;
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#endif
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/* open the file and read the property value */
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snprintf(path, sizeof(path), "%s/%s", PERSISTENT_PROPERTY_DIR, entry->d_name);
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fd = open(path, O_RDONLY);
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if (fd >= 0) {
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length = read(fd, value, sizeof(value) - 1);
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if (length >= 0) {
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value[length] = 0;
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property_set(entry->d_name, value);
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} else {
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ERROR("Unable to read persistent property file %s errno: %d\n", path, errno);
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}
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close(fd);
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} else {
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ERROR("Unable to open persistent property file %s errno: %d\n", path, errno);
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}
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}
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closedir(dir);
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} else {
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ERROR("Unable to open persistent property directory %s errno: %d\n", PERSISTENT_PROPERTY_DIR, errno);
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}
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persistent_properties_loaded = 1;
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}
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void property_init(void)
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{
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init_property_area();
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load_properties_from_file(PROP_PATH_RAMDISK_DEFAULT);
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}
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int properties_inited(void)
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{
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return property_area_inited;
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}
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void start_property_service(void)
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{
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int fd;
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load_properties_from_file(PROP_PATH_SYSTEM_BUILD);
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load_properties_from_file(PROP_PATH_SYSTEM_DEFAULT);
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load_properties_from_file(PROP_PATH_LOCAL_OVERRIDE);
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/* Read persistent properties after all default values have been loaded. */
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load_persistent_properties();
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fd = create_socket(PROP_SERVICE_NAME, SOCK_STREAM, 0666, 0, 0);
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if(fd < 0) return;
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fcntl(fd, F_SETFD, FD_CLOEXEC);
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fcntl(fd, F_SETFL, O_NONBLOCK);
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listen(fd, 8);
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|
property_set_fd = fd;
|
|
}
|
|
|
|
int get_property_set_fd()
|
|
{
|
|
return property_set_fd;
|
|
}
|